From 65243ad7aef48af4689ea4454916b504025b5051 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Fri, 25 Sep 2020 14:10:58 +0200
Subject: Emit QScreen::geometryChanged when the logical DPI changes

Add the missing call to QScreenPrivate::emitGeometryChangeSignals()
along with an emission of physicalDotsPerInchChanged()
since that is calculated from geometry and physical size.

Rearrange the code in
QGuiApplicationPrivate::processScreenGeometryChange()
to prevent duplicate emissions of geometryChanged(),
physicalDotsPerInchChanged() which this change would introduce.

Amends 5290027e3bab75f14fc0a2b7c206594d9cb91e76.

Task-number: QTBUG-76902
Task-number: QTBUG-79248
Fixes: QTBUG-86604
Change-Id: I3dc2ec5ccd9c6413e92f9246242f323e8afc5e57
Reviewed-by: David Edmundson <davidedmundson@kde.org>
(cherry picked from commit 5c7307775d32ae0a54acad8ae7a1c9d3cff7d45e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/gui/kernel/qguiapplication.cpp | 11 +++++------
 src/gui/kernel/qscreen.cpp         |  6 ++++++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 239a78313c..ef09060581 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -3162,13 +3162,14 @@ void QGuiApplicationPrivate::processScreenGeometryChange(QWindowSystemInterfaceP
     bool availableGeometryChanged = e->availableGeometry != s->d_func()->availableGeometry;
     s->d_func()->availableGeometry = e->availableGeometry;
 
-    if (geometryChanged) {
-        Qt::ScreenOrientation primaryOrientation = s->primaryOrientation();
+    const Qt::ScreenOrientation primaryOrientation = s->primaryOrientation();
+    if (geometryChanged)
         s->d_func()->updatePrimaryOrientation();
 
-        emit s->geometryChanged(s->geometry());
+    s->d_func()->emitGeometryChangeSignals(geometryChanged, availableGeometryChanged);
+
+    if (geometryChanged) {
         emit s->physicalSizeChanged(s->physicalSize());
-        emit s->physicalDotsPerInchChanged(s->physicalDotsPerInch());
         emit s->logicalDotsPerInchChanged(s->logicalDotsPerInch());
 
         if (s->primaryOrientation() != primaryOrientation)
@@ -3178,8 +3179,6 @@ void QGuiApplicationPrivate::processScreenGeometryChange(QWindowSystemInterfaceP
             updateFilteredScreenOrientation(s);
     }
 
-    s->d_func()->emitGeometryChangeSignals(geometryChanged, availableGeometryChanged);
-
     resetCachedDevicePixelRatio();
 }
 
diff --git a/src/gui/kernel/qscreen.cpp b/src/gui/kernel/qscreen.cpp
index df628fcc73..a1afc1ba14 100644
--- a/src/gui/kernel/qscreen.cpp
+++ b/src/gui/kernel/qscreen.cpp
@@ -88,6 +88,9 @@ void QScreenPrivate::updateGeometriesWithSignals()
 void QScreenPrivate::emitGeometryChangeSignals(bool geometryChanged, bool availableGeometryChanged)
 {
     Q_Q(QScreen);
+    if (geometryChanged)
+        emit q->geometryChanged(geometry);
+
     if (availableGeometryChanged)
         emit q->availableGeometryChanged(availableGeometry);
 
@@ -96,6 +99,9 @@ void QScreenPrivate::emitGeometryChangeSignals(bool geometryChanged, bool availa
         for (QScreen* sibling : siblings)
             emit sibling->virtualGeometryChanged(sibling->virtualGeometry());
     }
+
+    if (geometryChanged)
+        emit q->physicalDotsPerInchChanged(q->physicalDotsPerInch());
 }
 
 void QScreenPrivate::setPlatformScreen(QPlatformScreen *screen)
-- 
cgit v1.2.1

